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Friday, May 16, 2014

Could 'Quantum Navigation' Replace GPS?

As reported by The Daily Mail UK: UK scientists say they are three to five years away from creating a
new navigation system that would not rely on space-based technologies. A
“quantum compass” might replace the US’s widely-used GPS, first in
military and then on smartphones.The British Ministry of Defense is investing millions of pounds
into the “earth-based” technology, which they hope may become an
alternative to space-based GPS on board nuclear submarines and
ships.
Part of the reason the MoD is so keen to develop a “quantum
compass” is that GPS doesn't work underwater.
When submarines dive they navigate using accelerometers to
register every twist and turn of the vessel. However, this method
is not very accurate.
“Today, if a submarine goes a day without a GPS fix we’ll
have a navigation drift of the order of a kilometer when it
surfaces,” says Neil Stansfield from the UK Defense Science
and Technology Laboratory (DSTL) at Porton Down that is working
on the project.
Eventually, a “quantum compass” might be available for smartphone
users who now use GPS to pinpoint their location.The DSTL’s team was inspired by the Nobel-prize winning discovery
that revealed that lasers can trap and cool a cloud of atoms
placed in a vacuum to less than a millionth of a degree above
absolute zero, to temperatures a billion times colder than outer
space.At their lowest energies, the atoms become the coldest known
bodies in the universe.Super-cooled low energy atoms are
extremely sensitive to changes in the Earth’s magnetic and
gravitational field.
If trapped on a small device, their fluctuations can allow
scientists to track their movements from great distances away and
their locations pinpointed with extreme precision.
So far, the Defense Science and Technology Laboratory has
developed a quantum navigation system resembling a
“1-meter-long shoe box,” according to Stansfield.
Scientists are now focusing their efforts on miniaturizing the
device, so that it can be used by soldiers and not just on board
submarines and ships.
“Quantum TNS [Time, Navigation and Sensing] technologies
could bring game-changing advantages to the UK defense sector and
support markets measured in billions of pounds, here in the UK
and around the world,” Stansfield said.
Unlike GPS, the pioneer in the field of pinpointing locations, a
“quantum compass” will be interference-proof. The US has
repeatedly warned that its GPS is vulnerable to attacks and deliberate disruption.
A “quantum compass,” may also be used to create the world's most
accurate atomic clocks, scientists say.
In 2013, the UK announced an investment of £270 million ($453.3 million) over five
years to research the possibility of incorporating quantum
science in new products and services, the Financial Times
reports. According to the newspaper, companies including Nokia,
Hitachi and Toshiba have established quantum research
laboratories in Britain. In related news, European robins may maintain quantum entanglement in their eyes a full 20 microseconds longer than the best
laboratory systems, say physicists investigating how birds may use
quantum effects to “see” Earth’s magnetic field.It’s been proposed that
birds’ eyes contain entanglement-based compasses. Conclusive proof doesn't yet exist, but multiple lines of evidence
suggest it. Findings like this one underscore just how sophisticated
those compasses may be.“How can a living system have evolved to protect a quantum state as
well — no, better — than we can do in the lab with these exotic
molecules?” asked quantum physicist Simon Benjamin of Oxford University and the National University of Singapore, a co-author of the new study. “That really is an amazing thing.”Many animals — including not only birds, but some mammals, fish,
reptiles, even crustaceans and insects — navigate by sensing the
direction of Earth’s magnetic field. Physicist Klaus Schulten
of the University of Illinois at Urbana-Champaign proposed in the late
1970s that bird navigation relied on some geomagnetically sensitive,
as-yet-unknown biochemical reaction taking place in their eyes.Research since then has revealed the existence of special optical cells containing a protein called cryptochrome.
When a photon enters the eye, it hits cryptochrome, giving a boost of
energy to electrons that exist in a state of quantum entanglement. One of the electrons migrates a few nanometers away, where it feels a
slightly different magnetic field than its partner. Depending on how
the magnetic field alters the electron’s spin, different chemical
reactions are produced. In theory, the products of many such reactions
across a bird’s eye could create a picture of Earth’s magnetic field as a
varying pattern of light and dark.

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About Me

I have more than 25 years of experience in development, design, and mobile communications products and technology. I also enjoy skiing, hiking, scuba, tennis, reading, traveling, foreign languages, and painting. I'm an active member of the National Ski Patrol (NSP) and volunteer my time at either Loveland Ski resort, or Ski Cooper.